Extra High Voltage (EHV) Transformers
Transformers with primary voltage of 66 kV and above are conventionally termed as Extra High Voltage (EHV) Transformers. These transformers are generally used in the transmission sector. We at Aarambhi industries have facility to manufacture EHV transformer upto 50 mVA 132 kV class.
TECHNICAL SPECIFICATIONS |
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| Rating | Upto 50 mVA | |
| Duty Type | Outdoor/Indoor | |
| Voltage Class | 33, 66, 132 kV or as per customer’s requirement | |
| No Of Phases | 3 phase | |
| Frequency | 50/60 Hz | |
| Vector Group | Dyn5 or Dyn11 or YNyn0 or as per customer's requirement | |
| Insulating Fluid | PCB FREE Mineral Oil, both inhibited & uninhibited, as per IS/IEC and customer requirement | |
| Class Of Insulation | Class A | |
| Tap Changer | Off Circuit or On Load | |
| Tapping Range | + 2.5% X 2 for OCTC or + 1.25% X 4 & -1.25% X 8 for OLTC or as per customer requirement | |
| Winding Material | Copper with multi paper covering | |
| Applicable Standards | IS 2006,IEC76,ANSI,IEEE | |
| Painting | Enamel, Epoxy, Polyurethane or customer specific | |
SALIENT FEATURES OF MAKE EHV TRANSFORMERS |
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| - Custom made to meet each and every requirement customers conforming to National & international Standards | ||
| - Designed by experienced expert engineers using most modern software | ||
| - Highest dielectric insulation property to withstand Lightening Impulse | ||
| - Permali wood clamping rings for uniform compression of primary and secondary windings | ||
| - Step lap core design with multiple sheets per bag used in the core lamination jointing | ||
| - Designed using advanced software like AutoCAD & ProE to ensure adherence to the design parameters | ||
| - Pre composed Insulation material for minimal moisture absorption | ||
| - In House Fabrication with Laser and CNC machines | ||
| - Facility to make 8-10 Transformers per month. | ||
STANDARD FITTINGS |
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|---|---|---|---|
| H.V. Bushing / L.V Bushing | Conservator oil filling hole | Bi- directional rollers | |
| Earthing terminals pads | Drain cum bottom filter valve | Top filter valve with sampling plug | |
| Plain Oil Level gauge | Rating diagram plate | Air release device | |
| Thermometer Pocket | Lifting Lugs | Pressed Steel Radiators (Detachable) | |
| Double Diaphragm Explosion Vent | Silica gel breather | Additional Neutral bushing | |
| First filling of oil | Isolating valves for radiator | Jacking Pads | |
| Dial type OTI with A/T contacts | Buchholz relay with A/T contacts | Marshalling box with control wiring | |
OPTIONAL FITTINGS |
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|---|---|---|---|
| Dial type WTI with A/T contacts | Magnetic Oil Gauge with A/T contacts | On Load tap Changer | |
| RTCC Panel with automatic voltage Regulator (AVR) | Pressure Release valve | DGPT Relay | |
| Air cell bag | Scada Compatible OTI & WTI | Equaliser pipe between conservator & Explosion vent | |
| Annunciators in RTCC panel | Force cooling arrangement with Fan Cubical | ||